Why this matters: Acutely ill patients may deteriorate rapidly from infection, trauma, bleeding, respiratory failure, cardiac disease, poisoning, metabolic crisis or postoperative complications. EMTs and emergency nurses save lives by recognising abnormal trends early, repeating ABCDE assessments, starting simple interventions, escalating clearly and recording fluid balance accurately.
Scope and safety: This is a detailed learning guide, not a substitute for local protocols, senior review or a hospital early-warning system. Treat life-threatening abnormalities immediately, call for help early and reassess the response to every intervention.
Learning outcomes
- Recognise clinical signs and trends of deterioration in acutely ill adults.
- Use ABCDE, SAMPLE history and early warning tools without allowing a score to replace clinical judgement.
- Plan continuous or frequent monitoring according to risk and treatment.
- Complete an accurate intake/output and fluid-balance chart, including hidden and ongoing losses.
- Assess dehydration, overload, shock, renal dysfunction and electrolyte danger.
- Escalate, hand over and document deterioration using a structured approach.
1. What is an acutely ill patient?
An acutely ill patient has a new or rapidly worsening condition that threatens airway, breathing, circulation, neurological function, temperature regulation or organ perfusion. The patient may be in the emergency department, ward, ambulance, theatre or community. A “normal” single observation does not exclude deterioration; the direction and speed of change matter.
| Pattern | Possible cause | Immediate concern |
|---|---|---|
| Increasing respiratory rate/work | Pneumonia, asthma/COPD, PE, pulmonary oedema, sepsis, acidosis. | Impending ventilatory failure or hypoxaemia. |
| Falling BP/weak pulse | Bleeding, dehydration, sepsis, cardiogenic/obstructive shock, anaphylaxis. | Inadequate organ perfusion and arrest risk. |
| New confusion/agitation | Hypoxia, glucose/electrolytes, infection, stroke, toxins, pain or retention. | Delirium/neurological emergency; unsafe airway or self-harm. |
| Fever or hypothermia | Infection, exposure, drug reaction, endocrine crisis. | Sepsis, metabolic failure or impaired coagulation. |
| Low urine output | Shock, dehydration, obstruction, AKI or nephrotoxin. | Worsening renal perfusion, fluid/electrolyte crisis. |
2. Signs of deterioration
| Domain | Warning signs | What to do |
|---|---|---|
| Airway | Stridor, gurgling, snoring, drooling, swelling, inability to speak or protect airway. | Call for help, position/suction/open airway and prepare advanced airway support. |
| Breathing | RR rising/falling, severe effort, cyanosis, low SpO2, silent chest, exhaustion, rising ETCO2. | Oxygen/ventilation, ABG/ETCO2, bronchodilator/NIV/airway escalation as indicated. |
| Circulation | Tachycardia/bradycardia, hypotension, narrow pulse pressure, cold/mottled skin, delayed capillary refill. | Control bleeding, ECG, IV/IO access, fluids/blood/vasopressor pathway and source treatment. |
| Disability | New confusion, reduced GCS, seizure, unequal pupils, agitation, weakness or severe headache. | Glucose, oxygenation, neurological exam, seizure precautions and urgent review. |
| Exposure | Rash, fever/hypothermia, bleeding, abdominal distension, wounds, pressure injury. | Expose systematically while preventing heat loss; search for cause and infection source. |
Patient concern counts: “I feel worse,” new breathlessness, dizziness, chest pain, severe pain, confusion or reduced urine can precede abnormal numbers. Listen, reassess and escalate even when an early-warning score is low.
3. ABCDE assessment and immediate treatment
- Airway: assess speech, obstruction, secretions, swelling and aspiration risk; open, suction, use an adjunct and call airway help.
- Breathing: count RR for a full minute when irregular, inspect work of breathing, measure SpO2/ETCO2, listen and give targeted oxygen/ventilation.
- Circulation: pulse, BP, perfusion, ECG, bleeding, temperature, IV/IO access, lactate and cautious fluid/vasopressor strategy.
- Disability: AVPU/GCS, pupils, glucose, seizures, pain, delirium and medication/toxin history.
- Exposure: inspect skin, wounds, abdomen, back, drains, urine, lines and environment; preserve dignity and warmth.
4. Continuous and frequent monitoring
Monitoring intensity is matched to risk, not convenience. A stable patient may need scheduled observations; a patient with shock, respiratory failure, altered consciousness or active treatment needs continuous ECG/SpO2 and frequent clinical review. Document the frequency and reason rather than writing “stable” without values.
| Monitor | What it detects | Limitations/clinical tips |
|---|---|---|
| Respiratory rate/work | Early respiratory failure, sepsis, pain, acidosis and fatigue. | Count accurately; do not copy a previous value or rely only on monitor alarms. |
| SpO2/oxygen device | Hypoxaemia and response to oxygen. | Check waveform/perfusion; oxygen can mask worsening hypoventilation. |
| ECG/heart rate | Arrhythmia, ischaemia, treatment effects and shock. | Confirm pulse and lead quality; interpret rhythm with symptoms/BP. |
| Blood pressure/MAP | Perfusion and treatment response. | Trend; cuff size/position and arrhythmia affect accuracy. |
| GCS/AVPU/pupils | Neurological or metabolic deterioration. | Compare with baseline and consider sedation, language, disability and hypoglycaemia. |
| Temperature | Infection, hypothermia, drug reaction and heat illness. | Use a reliable method; fever may be absent in older/immunocompromised patients. |
| Urine/fluid balance | Renal perfusion, shock, overload and treatment response. | Measure, not estimate; include drains, vomit, stool and insensible losses where required. |
5. Early warning scores (EWS/NEWS2)
Early warning systems combine observations such as RR, SpO2, oxygen requirement, temperature, systolic BP, pulse and consciousness to trigger a response. They standardise communication and help identify deterioration, but they do not replace clinical judgement. Use the facility’s validated chart and escalation thresholds; do not manually invent scores or ignore a patient who “looks ill.”
| Score workflow | Good practice |
|---|---|
| Measure | Obtain a complete set at the same time; record oxygen device/flow and new confusion. |
| Calculate | Use the approved chart/calculator; check arithmetic and abnormal single parameters. |
| Interpret | Look at trajectory, baseline, comorbidities, treatment and clinician concern. |
| Escalate | Follow the response pathway: repeat observations, urgent clinician review, senior/critical-care call or emergency team. |
| Reassess | Repeat after intervention and document the effect; a rising score is a clinical event. |
6. Frequency of observations
- Increase frequency when a vital sign is abnormal, the patient is receiving oxygen/fluids/sedatives, or the condition is changing.
- Use continuous ECG/SpO2 and frequent BP/mental-state checks for shock, respiratory failure, arrhythmia, severe sepsis, post-sedation or high-risk transfer.
- After an intervention, state when the next reassessment will occur; do not wait for routine rounds.
- Document refusal, inability to measure, equipment failure and what alternative assessment was used.
7. Structured history: SAMPLE and deterioration timeline
- S — Symptoms: onset, progression, pain, breathlessness, fever, vomiting, urine, mental state.
- A — Allergies: medicines, food, latex and previous reactions.
- M — Medicines: prescriptions, recent changes, adherence, anticoagulants, insulin, steroids, sedatives.
- P — Past history: heart/lung/renal/liver disease, diabetes, pregnancy, surgery and baseline function.
- L — Last intake/output: food/fluid, vomiting/diarrhoea, urine and last medication.
- E — Events: trauma, infection exposure, procedures, new symptoms and treatment response.
8. Fluid balance: the essentials
Fluid balance compares measurable intake with measurable output over a defined period. It is a clinical tool, not merely a charting task. A positive balance may reflect resuscitation, but persistent accumulation can cause pulmonary oedema, impaired wound healing and organ dysfunction. A negative balance may indicate recovery from overload or dangerous dehydration.
Net balance = total intake − total output. Always state the time period (hourly, shift, 24-hour cumulative) and compare with weight, perfusion, lungs, oedema, renal function and treatment goals.
What counts as intake?
| Intake source | Examples | Charting point |
|---|---|---|
| Oral | Water, tea, porridge, soup, oral rehydration, nutritional feeds. | Measure cups/bottles; do not write “drank well.” |
| IV fluids | Crystalloid, blood products, maintenance fluids, flushes and drug diluents. | Record product, volume, rate, start/stop and actual infused volume. |
| Enteral/parenteral nutrition | NG feeds, free water, TPN. | Include feed water and interruptions; check pump totals. |
| Medication/flushes | IV antibiotics, boluses, line flushes, contrast. | Small volumes accumulate in renal/cardiac failure. |
| Blood products | Whole blood, packed cells, plasma, platelets. | Record exact unit volume and completion time; monitor reaction. |
What counts as output?
| Output source | How to measure | Why it matters |
|---|---|---|
| Urine | Graduated container or catheter bag at prescribed intervals; document colour and concentration. | Renal perfusion, AKI, obstruction and response to fluids. |
| Vomitus/NG aspirate | Measure in a calibrated bowl/canister; note blood/bile. | Dehydration, electrolyte loss and aspiration risk. |
| Stool/diarrhoea | Estimate/measure frequency and volume; document watery/bloody output. | Fluid/electrolyte loss and infection risk. |
| Drains/chest tubes | Record hourly/shift volume, colour and sudden changes. | Bleeding, leaks, chyle, infection or surgical complication. |
| Wounds/burns | Use dressing weights/clinical protocol where required. | Large hidden losses may cause shock. |
| Insensible losses | Consider fever, tachypnoea, burns and open wounds; use local estimation. | Not directly measured, so interpret balance with weight and examination. |
9. Fluid-balance chart example
| Time | Oral (mL) | IV/feeds/meds (mL) | Total intake | Urine | Other output | Total output | Net |
|---|---|---|---|---|---|---|---|
| 06:00–08:00 | 150 | 250 | 400 | 120 | 0 | 120 | +280 |
| 08:00–10:00 | 100 | 300 | 400 | 40 | 100 vomit | 140 | +260 |
| 10:00–12:00 | 0 | 250 | 250 | 20 | 150 drain | 170 | +80 |
| Running total | 250 | 800 | 1,050 | 180 | 250 | 430 | +620 |
Charting discipline: Every entry needs a time, source, measured volume and initials/signature. At the end of the shift, add totals, calculate net balance, compare with target and report unexpected changes immediately.
10. Assessing hydration and fluid overload
| Dehydration/low volume | Overload/high volume |
|---|---|
| Thirst, dry mucosa, tachycardia, orthostatic symptoms, poor skin turgor, low urine, cool extremities. | Breathlessness, crackles, raised JVP, peripheral/sacral oedema, rapid weight gain, hypertension or worsening oxygen requirement. |
| Causes: bleeding, vomiting/diarrhoea, fever, burns, poor intake, diuretics, sepsis. | Causes: excessive IV fluid, renal/heart failure, liver disease, capillary leak, missed diuresis. |
| Interpret with BP, lactate, electrolytes, creatinine, urine and response to cautious fluid challenge. | Escalate before more fluid; evaluate lungs, renal function, ECG/ultrasound and prescribed diuretic/ventilatory plan. |
11. When to escalate urgently
- Airway obstruction, severe breathing difficulty, persistent hypoxaemia, exhaustion or rising CO2.
- Shock signs: hypotension, weak pulse, altered consciousness, cold/mottled skin, rising lactate or very low urine.
- New seizure, falling GCS, unequal pupils, sudden focal deficit or severe hypoglycaemia.
- Rapidly rising early-warning score, new oxygen requirement, repeated abnormal observations or staff/patient concern.
- Major bleeding, suspected sepsis, anaphylaxis, poisoning, severe electrolyte disturbance or fluid overload.
- Failure to respond to initial treatment or inability to monitor safely in the current location.
12. Fluid treatment principles
- Identify the goal: restore perfusion, replace a measured loss, maintain hydration, deliver medicine or remove excess fluid.
- Choose the correct fluid and route according to diagnosis, age, weight, comorbidities and local protocol.
- Give boluses cautiously when appropriate and reassess pulse, BP, perfusion, lungs, urine, mental state and lactate.
- Stop or escalate if pulmonary oedema, worsening oxygen need, new crackles, raised JVP or no perfusion response develops.
- Adjust maintenance and replacement for renal/heart/liver failure, burns, fever, diarrhoea, drains and ongoing losses.
- Record prescription, actual volume, rate, response and adverse effects; never assume pump volume equals delivered volume.
13. Clinical scenarios
Scenario 1 — Sepsis deterioration: A patient’s RR rises from 22 to 34, BP falls, urine output drops and confusion develops. Repeat ABCDE, check glucose/lactate, give oxygen/ventilation support, obtain access, follow sepsis protocol and call the senior/critical-care team.
Scenario 2 — Fluid overload: A heart-failure patient receives IV fluids and develops crackles, orthopnoea and rising oxygen need. Stop/review the fluid, sit upright, oxygenate/consider NIV, assess perfusion and call the clinician; do not continue the chart mechanically.
Scenario 3 — Hidden losses: A patient with vomiting and a high-output drain has “normal” charted urine but becomes tachycardic and dizzy. Add all outputs, recalculate net balance, assess shock/electrolytes and report the ongoing loss.
Scenario 4 — False reassurance: A patient with COPD has SpO2 96% on high oxygen but becomes drowsy with slow breathing. Assess ventilation/ETCO2/ABG, titrate oxygen appropriately and prepare ventilatory support.
Scenario 5 — Early warning trigger: The calculated score is modest, but the nurse says “this patient looks different.” Repeat observations, examine the patient, check the trend and escalate; clinical concern should never be ignored.
14. Documentation and handover
- Baseline and repeat ABCDE findings, vital signs, oxygen/device, EWS value and escalation response.
- All treatment: oxygen, airway support, fluids/blood, medicines, procedures and response.
- Fluid chart totals: oral, IV, feeds, medication/flushes, urine, vomit, stool, drains and cumulative balance.
- Prescribed target balance, weight, renal/electrolyte results, lactate, glucose and relevant comorbidities.
- Time of senior review, advice received, receiving team, family communication and next reassessment time.
15. Revision questions
- Why is a trend more useful than one normal observation?
- List six signs of deterioration in breathing or circulation.
- What does ABCDE require before moving to the next step?
- What parameters commonly contribute to an early warning score?
- Why must oxygen flow/device be documented with SpO2?
- What sources of intake are often missed on a fluid chart?
- What outputs must be measured besides urine?
- How can positive fluid balance harm a patient?
- What signs suggest fluid overload rather than dehydration?
- When should a fluid bolus be stopped and senior help called?
16. Key take-home points
- Recognise deterioration early, treat life threats immediately and reassess after every intervention.
- Use early-warning tools to standardise escalation, never to replace clinical judgement.
- Continuous monitoring means watching trends, treatment response and the patient—not just a screen.
- Accurate fluid balance requires measured intake/output, running totals and clinical interpretation.
- Escalate promptly for respiratory failure, shock, neurological change, sepsis, poisoning or fluid overload.
Selected authoritative resources
- Resuscitation Council UK ABCDE approach.
- NICE: Acutely ill adults in hospital—recognising and responding to deterioration.
- Royal College of Physicians: NEWS2.
- WHO Emergency Care Toolkit.
For EMT practice: A complete set of observations, a truthful fluid chart and a timely escalation can reveal deterioration before the patient arrests. Measure carefully, think clinically and communicate early.